Portable power source



FIG. 1 is a front view of a portable power source showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a first perspective view thereof;

FIG. 8 is a second perspective view thereof;

FIG. 9 is a third perspective view thereof;

FIG. 10 is a fourth perspective view thereof; and,

FIG. 11 is a fifth perspective view thereof. 

CLAIM The ornamental design for a portable power source, as shown and described. 